Concatenations of pairs of primes that differ by 6.

Terms

a(0) =511a(1) =713a(2) =1117a(3) =1319a(4) =1723a(5) =2329a(6) =3137a(7) =3743a(8) =4147a(9) =4753a(10) =5359a(11) =6167a(12) =6773a(13) =7379a(14) =8389a(15) =97103a(16) =101107a(17) =103109a(18) =107113a(19) =131137a(20) =151157a(21) =157163a(22) =167173a(23) =173179a(24) =191197a(25) =193199a(26) =223229